793B Off-Highway Truck Air System and Brakes Brake Valve (Parking and Secondary) Caterpillar


Brake Valve (Parking and Secondary)
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793B Off-Highway Truck Air System and Brakes [SENR6339]
BRAKING SYSTEM
VALVE GP
793B Off-Highway Truck Air System and Brakes Brake Valve (Parking and Secondary)


Illustration 1g02247993

(3) Lubricate the sealing lip of the lip type seal lightly with the lubricant that is being sealed.

(5) Relief valve group

Torque for the relief valve group ... 65 ± 8 N·m (48 ± 5.9 lb ft)
Torque for the cap (2) ... 17 ± 2 N·m (150 ± 18 lb in)
Torque for the nut (4) ... 17 ± 2 N·m (150 ± 18 lb in)
Pressure setting for the relief valve group at a flow rate of 23.0 ± 2.0 L/min (6.1 ± 0.5 US gpm) ... 4700 ± 200 kPa (682 ± 29 psi)

(8) Lubricate the bore of the O-ring seal lightly with the lubricant that is being sealed.

Note: As required, use the shims (9) to adjust the pressure at brake port (6).

(9) Thickness of the 6J-8696 Shim ... 1.22 mm (0.048 inch)

(10) 9N-4049 Spring

Length under test force ... 21.84 mm (0.860 inch)
Test force ... 10.73 ± 0.53 N (2.41 ± 0.12 lb)
Free length after test ... 38.1 mm (1.50 inch)
Outside diameter ... 6.096 mm (0.2400 inch)

(11) 1K-4066 Spring

Length under test force ... 25 mm (1.0 inch)
Test force ... 178 to 222 N (40 to 50 lb)
Free length after test ... 38.1 mm (1.50 inch)
Outside diameter ... 11.113 ± 0.397 mm (0.4375 ± 0.0156 inch)

(12) Torque for check valve ... 80 ± 8 N·m (59 ± 5.9 lb ft)

Test information for the brake pressure:

Pressure at the brake port (6) at a flow rate of 23 ± 4 L/min (6 ± 1 US gpm) ... 4320 ± 200 kPa (627 ± 29 psi)
Air supply into the port (1) for test ... 550 ± 20 kPa (80 ± 3 psi)
Pressure at the pump port (7) at a flow rate of 23 ± 4 L/min (6 ± 1 US gpm) ... 4420 ± 100 kPa (641 ± 14 psi)